Service is GR8! Internet is fast. The only problem is the building I work in. Just about everyone in the building has an iPhone now and the 3G is slow inside. When I'm out of the building it's super fast and with WiFi its lightning! One good thing though, each train station has free WiFi. Well, if you subscribe to a cable service they offer the WiFi at the train stations. I would love it if the trains themselves had WiFi on them. I think they could do it. Would be GR8.

Evangelist

iPhone 4 on AT&T. My wife's is a 3GS. Never been on any other carrier so hard to compare speed. We share 700 minutes (downgraded fro 1400 with thousands of roll over minutes) two data plans and unlimited texting. Third phone for my daughter - $160/mo.

Genius

AT&T, not really many complaints, service has definitely improved in the past year and a half to the point where it is more reliable than my company issued BB Bold on Verizon. Pretty happy with the 3G data speeds, occasionally slow depending on the location.
5 lines with 700 minutes (4332 rollover minutes)
Unlimited texting and mobile to mobile which helps to rack up rollover minutes since no one has a landline anymore.
2 iPhone 4 with 2G data plan for each phone
3 standard no frills phones with no data plans and insurance on my daughter's phone.
Total is about $191 a month with a 20% corporate discount.

How does it compare to the upgrade eligibility in the U.S.? The total value of the low-end model is $650. We get a $450 discount on the device and pay $200. We are eligible for full subsidization every 17 months (single plan) with AT&T. It's every 12 months for the primary account holder on a family plan.